June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Chapter 12: PSTN Trunks
How Many Dial-Tone Trunks Are Needed?
Whether you use POTS or your dial-tone is brought to you by way of SIP, you’ve got
to make sure you’ve got enough trunks for your telephony application. If you’re
building a large hosted telephony application, like a call center, you’ll probably need
loads of them. If you’re building a simple PBX in your home, you may require only
one or two. In a medium-sized office, you might need a few dozen.
The place where your PSTN interfacing occurs is your PSTN connect point. Recall
that, through VoIP, you can have voice conversations over your IP network, which
may be a WAN that spans many, many miles. This will no doubt affect the location
of your PSTN connect point, as well as the number of trunks required at that point.
In Figure 12-1, you can see how a traditional wide area voice network might look. Its
connect points are at every location where there’s a PBX.
The case for fewer trunks
You’ll use fewer PSTN trunks if you leverage your IP network. Say you’ve got three
offices—one in New York, one in Detroit, and one in Kansas City. The one in
Who provides
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Cost per line Most Most Moderate Low Moderate Low
Calling features Usuallycost ...
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